IBKR · NASDAQ · CIK 0001381197
Interactive Brokers Group, Inc.
Interactive Brokers Group, Inc. holds 4 disclosed positions, 0 of them carrying a sourced value and 4 that nobody has sized.
Interactive Brokers Group, Inc. - Profile
- Sector
- FinancialsGICS
- Industry
- Security Brokers, Dealers & Flotation CompaniesSIC 6211
- Listed on
- Nasdaq
- Employees
- 3,182stated 2025
- Incorporated in
- Delaware
- Financial year ends
- 31 December
Source
Address, industry classification, listing and incorporation come from Interactive Brokers Group, Inc.'s own SEC filer record, so the industry is the SEC's dry classification rather than a marketing label. The headcount is the figure the sources below state for 2025. The description was written for this site in August 2026 from Interactive Brokers Group, Inc. Form 10-K for fiscal year 2025 and Interactive Brokers, Wikipedia, not taken from any single article.
Share price
IBKR
Description
Interactive Brokers Group, Inc. is an automated broker that routes, executes, clears and custodies trades in stocks, options, futures, foreign exchange, bonds, funds, precious metals and forecast contracts across more than 170 electronic exchanges and market centers in 40 countries. Its customers are hedge and mutual funds, registered investment advisors, proprietary trading groups, introducing brokers and individual investors, and it serviced approximately 4.4 million cleared accounts at 31 December 2025 with 3,182 staff. Total net revenues were $6.21 billion in 2025, up 20 percent, of which net interest income on margin loans, customer cash and securities lending was $3.56 billion, commissions $2.15 billion, other fees and services $291 million and other income $202 million. The listed company is a holding vehicle that owns about 26.3 percent of the operating entity IBG LLC; the other 73.7 percent is held through IBG Holdings LLC by founder and chairman Thomas Peterffy, his affiliates, and management and employees.
Equity stakes Interactive Brokers Group, Inc. holds in other companies.
No position on this side carries a sourced value, so there is nothing to chart. The table still lists 4 of them.
Select a row or a slice for its provenance: the filing it came from, when it was measured, and the arithmetic behind it if it was modelled.
The full register, from 13F filings
The Register tab above is hand research: a dozen holders, each traced to the filing it came from. This asks the same question of the whole market for the quarter ended 31-mar-2026, where 984 managers reported a position. Broad where the research is deep, and shallow in the ways a 13F always is.
984 managers reported a position, together holding 379.3m shares, or 83.7% of the company. The 40 largest are listed. Percentages are of a share count taken later than this quarter, because the count in force at the snapshot is not published as a structured fact for this company. Where the count has moved since, the figures are off by that much.
Built from 13F filings, which report US listed, long, US custodied positions only. A register from this source is a floor rather than a level: a holder's true position can be far larger, as BlackRock's ASML stake shows at 1.28m shares in a 13F against 26.3m in its 13G/A. Holdings held through derivatives, outside US custody, or below a manager's reporting obligation do not appear. Where a holder is marked as a family, its total sums several separate filing entities and describes something no single filing describes; the constituent entities and their share counts are listed so the total can be checked. That roll-up can legitimately exceed the family's own Schedule 13G, because a 13G is filed by one legal entity: Vanguard reports Alphabet through ten advisory entities, and The Vanguard Group Inc itself reported zero after its January 2026 disaggregation.
What a reader needs to know to read these numbers
- Interactive Brokers Group, Inc. (IBG, Inc.) is an up-C structure. The public Class A common stock and non-public Class B common stock are the only two classes of IBG, Inc. stock. IBG, Inc. itself owns only a minority economic interest (26.5% as of 30 Jun 2026, 26.6% as of 31 Jul 2026) in the operating partnership, IBG LLC. The remaining 73.5% (73.4% as of 31 Jul 2026) of IBG LLC membership interests is held by IBG Holdings LLC ('Holdings'), a private holding company owned by founder and Chairman Thomas Peterffy and his affiliates (~91.8% as of 31 Jul 2026), plus current and former management and employees of IBG LLC. As of 30 Jun 2026: IBG, Inc. held 450,671,113 IBG LLC membership interests, Holdings held 1,250,737,416, total 1,701,408,529.
- shares_outstanding (453,077,771) is Class A common stock outstanding as of 5 Aug 2026, taken from the cover page of the 10-Q for the quarter ended 30 Jun 2026 (dei:EntityCommonStockSharesOutstanding). Class B common stock outstanding is 400 shares, held entirely by Holdings; it is recorded separately in share_classes and is NOT included in shares_outstanding.
- Thomas Peterffy holds only 6,219,110 Class A shares directly (1.37% to 1.40% depending on share-count base). His real control comes through Holdings: he owns all of Holdings' voting membership interests, so he is deemed the beneficial owner of 100% of Class B (400 shares, votes proportional to Holdings' ~73.4% to 73.5% IBG LLC interest), giving him effective voting control of roughly 73% of the combined vote despite a small direct Class A position. Per the brief's up-C rule, Holdings' IBG LLC membership interests and Class B holding are recorded with shares: null on the IBG Holdings LLC register row rather than charted against the Class A denominator; the real quantities and instruments are in that row's method_note.
- IBKR (CIK 0001381197) does not file a Schedule 13F: its SEC submissions history contains no 13F-HR or 13F-NT filings. This is consistent with it being an operating/holding company rather than an institutional investment manager exercising discretion over a 13(f) securities portfolio; any client or market-making inventory sits at broker-dealer subsidiary level and is excluded from this file as client assets per the brief, not treated as a company holding.
- IBKR executed a 4-for-1 forward stock split via stock dividend; holders of record as of the close of market on 16 Jun 2025 received three additional shares (per the FY2025 10-K). All register figures in this file are drawn from Q2 2026 (period 30 Jun 2026) 13F-HR filings or the 9 Mar 2026 DEF 14A, all filed well after the split, so every figure here is already on the current post-split basis; no restatement was needed.
- Vanguard: parent Vanguard Group, Inc. (CIK 0000102909) filed Form 13F-NT (a notice carrying no holdings) for Q2 2026, so per this project's convention the 7 successor entities were summed to 41,660,754 shares rather than substituted with one row. See the Vanguard row's method_note for the per-entity breakdown.
- Capital Group and T. Rowe Price were each swept across all of their standard registrant CIKs; only Capital World Investors (of three Capital Group registrants) and T. Rowe Price Associates (of two T. Rowe registrants) actually hold IBKR as of Q2 2026. The other CIKs were checked and confirmed to hold zero, not omitted by assumption.
- Holdings side: IBKR's 10-Q (period 30 Jun 2026) discloses a combined $234m book of strategic/non-marketable equity investments (equity method $154m, equity securities at adjusted cost $39m, at fair value $39m, exchange memberships and equity securities of certain exchanges $2m), down from $288m at 31 Dec 2025, and names four investees within that book (BOX Options Exchange LLC, Miami International Holdings Inc/MIAX, Zero Hash Holdings Ltd, Next Securities Corporation) without splitting the balance by investee. Per the one-bucket rule, each is recorded with value/shares null rather than assigned a share of the combined total. Miami International Holdings is now public (NYSE: MIAX, IPO Aug 2025); its own Apr 2026 DEF 14A does not list Interactive Brokers among its 5%-or-more holders, so even the target's own filings do not size the stake.
- Self-gate (computed on the final file exactly as the register chart does, container reduced by its listed member, everything else at full value): total charted shares = 140,314,433 (Vanguard 41,660,754 + BlackRock 33,129,663 + State Street 19,437,767 + FMR 11,828,151 + Geode 10,641,906 + Kayne Anderson Rudnick 6,365,531 + Capital Group 3,255,412 + T. Rowe Price 1,504,030 + Thomas Peterffy 6,219,110 + IBG Holdings LLC 0 [null] + officers/directors group residual 6,272,109). 140,314,433 / 453,077,771 = 30.97% of Class A shares outstanding.
- market_cap_usd (154,079,556,386) uses the total combined IBG LLC membership interests (1,701,408,529 as of 30 Jun 2026) at the 18 Aug 2026 close of $90.56, matching the convention major aggregators (Yahoo Finance, Investing.com) use for IBKR given the up-C structure, rather than the narrower Class A-only market cap (453,077,771 x $90.56 = approximately $41.0bn). Readers focused strictly on the public float should use the narrower figure.
Looked for, not found
Recorded rather than filled in. Each of these is a place where a number could have been invented and was not.
- Individual share count, value or ownership percentage for each of BOX Options Exchange LLC, Miami International Holdings Inc (MIAX), Zero Hash Holdings Ltd and Next Securities Corporation: IBKR's 10-Q and 10-K disclose only a combined $234m investments balance across equity-method, adjusted-cost and fair-value equity securities line items, not split by investee. Looked in: 10-Q for the quarter ended 30 Jun 2026 and 10-K for FY2025, Investments footnote; MIAX's own Apr 2026 DEF 14A 5%-holder table (IBKR not listed there either).
- Register holders beyond the 8 institutional/index families and Kayne Anderson Rudnick shown here (e.g. Wellington Management, Invesco, Two Sigma, JPMorgan, Egerton Capital, Bank of America, Orbis Allan Gray) were not individually refreshed to Q2 2026 13F-HR filings given the time budget for this file. This project's own Q1 2026 (31 Mar 2026) 13F snapshot (data/registers/IBKR.json) shows approximate prior-quarter sizes for several of these, but per the brief's own caution against using that snapshot for figures (only for the entity list), they are omitted here rather than reused unverified.
- Precise split of the ~91.8% Holdings ownership between Thomas Peterffy individually and his other affiliates is not disclosed; only the combined 'Mr. Thomas Peterffy and his affiliates' percentage is reported.